HARRISBURG, Pa. (WHTM) — Truth be told, most of us probably never thought much about slide charts and wheel charts, much less what it would take to be certified the world’s top collector of them. But ...

The slide rule, sometimes called a slipstick, was a type of mechanical analog computer. It was and still is, used primarily for multiplication and division, and also for functions such as roots, ...

DAUPHIN COUNTY, Pa. — Dale Rupert of Dauphin County has been collecting wheel and slide charts for the last 23 years and now holds the world record for his impressive collection. Since 2002, Rupert ...

Among my prized possessions I include Machinery's Handbook, which provides important information about fasteners, machining, tooling, gears, and materials. But this tome runs over 2,500 pages, so I ...